js中获取指定时间/当前时间前1(n)天,前1(n)月的时间

最新推荐文章于 2024-05-08 09:48:00 发布

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本文详细介绍如何使用JavaScript进行日期和时间的处理，包括获取当前时间的前后天数、前后月数，以及将时间戳转换为时间格式的方法。适用于前端开发者快速掌握日期处理技巧。

js获取当前时间的前1(n)天时间

    //将时间戳转化为时间
	function getDatetime(data){
		var _data = data;
		if(String(data).length==13){
			_data = data;
		}else{
			_data = data*1000;
		}
		var time = new Date(_data);
		var y  = time.getFullYear();
		var m = time.getMonth()>=10?time.getMonth()+1:'0'+(time.getMonth()+1);
		var day = time.getDate()>=10?time.getDate():'0'+time.getDate();
		var H = time.getHours()>=10?time.getHours():'0'+time.getHours();
		var min = time.getMinutes()>=10?time.getMinutes():'0'+time.getMinutes();
		var sec = time.getSeconds()>=10?time.getSeconds():'0'+time.getSeconds();
		return `${y}-${m}-${day} ${H}:${min}:${sec}`;
	}
	//必须将当前时间转化为时间戳
	var today = (new Date()).getTime();
	var day = 1;//1天
	var pre_time = today-24*day*60*60*1000;
	var pre_day  = getDatetime(pre_time);

js获取指定时间前1(n)天的时间

	function getUnix(string){
		var f  = string.split(' ',2);
		var Ymd  = (f[0]?f[0]:null).split('-',3);
		var His = (f[1]?f[1]:null).split(':',3);
		return (new Date(
				parseInt( Ymd[0],10)||null,
				parseInt(Ymd[1],10)-1||null,
				parseInt(Ymd[2],10)||null,
				parseInt(His[0],10)||null,
				parseInt(His[1],10)||null,
				parseInt(His[2],10)||null
		)).getTime()/1000;
	}
	function getDatetime(data){
		var _data = data;
		if(String(data).length==13){
			_data = data;
		}else{
			_data = data*1000;
		}
		var time = new Date(_data);
		var y  = time.getFullYear();
		var m = time.getMonth()>=10?time.getMonth()+1:'0'+(time.getMonth()+1);
		var day = time.getDate()>=10?time.getDate():'0'+time.getDate();
		var H = time.getHours()>=10?time.getHours():'0'+time.getHours();
		var min = time.getMinutes()>=10?time.getMinutes():'0'+time.getMinutes();
		var sec = time.getSeconds()>=10?time.getSeconds():'0'+time.getSeconds();
		return `${y}-${m}-${day} ${H}:${min}:${sec}`;
	}
	//将指定时间转化为时间戳
	var time_unix = getUnix('2020-01-01 20:32:12');
	var day = 1;//1天
	var pre_time = time_unix*1000-24*day*60*60*1000;
	var pre_day  = getDatetime(pre_time);

js中获取当前时间的前1(n)个月时间

    function get_pre_month(date,n){
		var arr = date.split('-');
		var year  = arr[0];
		var month = arr[1];
		var day = arr[2];
		var days = new Date(year,month,0);
		days = days.getDate();
		var year2  = year;
		var month2 = parseInt(month)-n;
		if(month2<=0){
			year2 = parseInt(year2) -1;
			month2 = 12+parseInt(month2); //month2为负值
		}
		var day2 = day;
		var days2  = new Date(year2,month2,0);
		days2 = days2.getDate();
		if(day2>days2){
			day2 =days2;
		}
		if(month2<10){
			month2 = '0'+month2;
		}
		var t2 = year2+'-'+month2+'-'+day2;
		return t2;
	}
	//将时间戳转化为时间
	function getDatetime(data){
		var _data = data;
		if(String(data).length==13){
			_data = data;
		}else{
			_data = data*1000;
		}
		var time = new Date(_data);
		var y  = time.getFullYear();
		var m = time.getMonth()>=10?time.getMonth()+1:'0'+(time.getMonth()+1);
		var day = time.getDate()>=10?time.getDate():'0'+time.getDate();
		var H = time.getHours()>=10?time.getHours():'0'+time.getHours();
		var min = time.getMinutes()>=10?time.getMinutes():'0'+time.getMinutes();
		var sec = time.getSeconds()>=10?time.getSeconds():'0'+time.getSeconds();
		return `${y}-${m}-${day} ${H}:${min}:${sec}`;
	}
	//获取当前时间
	var day = getDatetime(new Date().getTime());
	//获取当前时间的前1(n)个月时间
	var pre_day = get_pre_month(day,1);

js获取指定时间的前1(n)个月的时间

function get_pre_month(date,n){
		var arr = date.split('-');
		var year  = arr[0];
		var month = arr[1];
		var day = arr[2];
		var days = new Date(year,month,0);
		days = days.getDate();
		var year2  = year;
		var month2 = parseInt(month)-n;
		if(month2<=0){
			year2 = parseInt(year2) -1;
			month2 = 12+parseInt(month2); //month2为负值
		}
		var day2 = day;
		var days2  = new Date(year2,month2,0);
		days2 = days2.getDate();
		if(day2>days2){
			day2 =days2;
		}
		if(month2<10){
			month2 = '0'+month2;
		}
		var t2 = year2+'-'+month2+'-'+day2;
	   return t2;
}
	alert(get_pre_month("2020-03-03",4));